Square pile drill bit

Abstract

The utility model discloses a square pile drill bit, which relates to the technical field of engineering mechanical pile foundation equipment and comprises an upper mounting frame, a square head connector, a power mechanism, a middle connecting mechanism, a transfer spindle box, a milling wheel and a milling wheel lengthening ring. The square head connector and the power mechanism are both mounted on the upper mounting frame, the middle connecting mechanism is connected with the upper mounting frame and the transfer spindle box, the two milling wheels are assembled at the left end and the right end of the transfer spindle box respectively, and the two milling wheel lengthening rings are assembled at the outer ends of the two milling wheels respectively; the power mechanism is in driving connection with the transfer spindle box, the transfer spindle box is in driving connection with the two milling wheels at the left end and the right end, the power mechanism transmits power to the transfer spindle box, the transfer spindle box drives the two milling wheels at the left end and the right end and the two milling wheel lengthening rings to rotate synchronously, and therefore synchronous excavation of the two milling wheels at the left end and the right end is achieved; milling wheel lengthening rings with different lengths can be rapidly replaced, and the machine pile hole forming length can be freely changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery pile foundation equipment technical field more specifically, relate to a square pile drill bit. BACKGROUND

[0002] Engineering machinery pile foundation equipment is a kind of mechanical equipment for foundation engineering construction, mainly used in underground continuous wall foundation construction, deep foundation square groove construction, mountain anti-slide square pile hole foundation construction, rotary digging square hole pile foundation construction and so on, in pile foundation engineering, engineering machinery pile foundation equipment includes pile hammer, pile frame, hoisting machinery etc., for the pile foundation is penetrated into underground, reaches design elevation, and the bearing capacity of pile foundation is related to the diameter, length, material strength of pile and geological condition.

[0003] In the existing pile foundation engineering square pile construction, generally, first, using round drill bit to predrill hole, pile hole is processed into the shape similar to plum-blossom pile type, then specially-made square pile drill bit is used to dig into standard square pile hole.

[0004] In the prior art, the patent with publication number CN221144313U discloses a hydraulic square pile drill bit.The specific technical solution is: including rack main body, the rack main body both sides symmetry is provided with excavating assembly;The rack main body lower end is provided with walking assembly fixed seat, walking assembly fixed plate is set up in walking assembly fixed seat both ends, walking assembly fixed plate is connected with excavating walking assembly, excavating walking assembly is connected with excavating assembly;The rack main body both sides are provided with slewing bearing.Through setting up two groups of excavating assembly on rack main body, improve the working efficiency of excavating assembly and the rotating speed of excavating wheel.

[0005] The hydraulic square pile drill bit disclosed in the above patent has the following problems:

[0006] 1, left and right excavating assemblies are driven by respective hydraulic motors to excavate, it is difficult to ensure that the left and right excavating assemblies rotate synchronously, and it is not suitable for some working conditions that require the left and right excavating assemblies to rotate synchronously.

[0007] 2, the length of the excavating wheel body is fixed, and the length of the pile hole formed by the machine cannot be freely changed. UTILITY MODEL CONTENT

[0008] In order to overcome the defects in the above-mentioned prior art, the utility model aims to provide a square pile drill bit to solve the problems of difficulty in ensuring that the left and right excavating assemblies rotate synchronously and inability to freely change the length of the pile hole formed by the machine.

[0009] In order to achieve the above-mentioned purposes, the utility model adopts the following technical solutions:

[0010] A square pile drill bit comprises an upper mounting frame, a square head connector, a power mechanism, a middle connecting mechanism, a split main shaft box, a milling wheel and a milling wheel extension ring.

[0011] The square head connector and the power mechanism are both mounted on the upper mounting frame, the middle connecting mechanism connects the upper mounting frame and the split main shaft box, the milling wheel is provided with two and is assembled at the left and right ends of the split main shaft box respectively, and the milling wheel extension ring is provided with two and is assembled at the outer ends of the two milling wheels respectively.

[0012] The power mechanism is drivingly connected with the split main shaft box, the split main shaft box is drivingly connected with the two milling wheels at the left and right ends, the power mechanism transmits power to the split main shaft box, and the split main shaft box drives the two milling wheels at the left and right ends and the two milling wheel extension rings to rotate synchronously.

[0013] Preferably, the power mechanism comprises a gear box, a power source, a power input gear, a power transition gear, a power output gear and a power output shaft.

[0014] The gear box is assembled on the upper mounting frame, the power source is provided with two and is assembled on the gear box, the diameters of the power input gear, the power transition gear and the power output gear increase in sequence and are all located in the gear box, the power input gear is provided with two and is assembled on the output shafts of the two power sources respectively, the power transition gear is meshed with the two power input gears respectively, the power output gear is meshed with the power transition gear, and the power output shaft is fixed at one end on the power output gear and is connected at the other end with the split main shaft box through the middle connecting mechanism.

[0015] Preferably, the middle connecting mechanism comprises a top plate, a vertical plate and a bottom plate.

[0016] The top plate is assembled on the upper mounting frame, the vertical plate is connected at the top end with the top plate and at the bottom end with the bottom plate, and the bottom plate is assembled on the split main shaft box, and the top plate, the vertical plate and the bottom plate are provided with shaft holes for the power output shaft to pass through.

[0017] Preferably, the split main shaft box comprises a box body, a main shaft, a main conical helical gear, a slave shaft and a slave conical helical gear.

[0018] The box body is assembled on the middle connecting mechanism, the main shaft is vertically assembled in the box body and is drivingly connected with the power mechanism, the main conical helical gear is assembled on the main shaft, the slave shaft and the slave conical helical gear are both provided with two, the two slave shafts are horizontally assembled in the box body and are drivingly connected with the two milling wheels respectively, and the two slave conical helical gears are assembled on the two slave shafts and are both meshed with the main conical helical gear.

[0019] Preferably, the split main shaft box further comprises a main shaft bearing, a slave shaft bearing, a main shaft bearing cover and a slave shaft bearing cover.

[0020] Both the main shaft bearing and the driven shaft bearing are located inside the housing. The main shaft and the driven shaft are respectively assembled inside the main shaft bearing and the driven shaft bearing. The main shaft bearing cover and the driven shaft bearing cover are respectively assembled on the side of the main shaft bearing and the driven shaft bearing.

[0021] Preferably, the milling wheel extension ring has multiple different lengths, and the milling wheel extension ring can be detachably assembled to the outer end of the milling wheel;

[0022] Both the milling wheel and the milling wheel extension ring include a wheel body, a tooth holder, and a digging tooth; the wheel body is equipped with multiple tooth holders, and the digging tooth is mounted on each of the multiple tooth holders.

[0023] Preferably, the inner side of the milling wheel is provided with an inner fork wear-resistant ring, and a fork tooth seat is movably mounted on the inner fork wear-resistant ring. The fork tooth seat is equipped with the cutting tooth. The outer side of the connecting mechanism and the split spindle box are both provided with a first guide ring for guiding the fork tooth seat. The outer side of the spindle box is also provided with a second guide ring for guiding the fork tooth seat. The fork tooth seat moves between the first guide ring and the second guide ring.

[0024] Preferably, the square pile drill bit further includes a deceleration connection mechanism, which includes a reducer, a slewing support bearing, a water sealing adapter flange, and a milling wheel adapter flange;

[0025] The input end of the reducer is driven to the output end of the transfer spindle box. The fixed end of the slewing support bearing is fixed to the transfer spindle box through a water-sealing adapter flange. The rotating end is fixedly connected to the milling wheel adapter flange. The milling wheel adapter flange is fixedly connected to the output end of the reducer and the milling wheel respectively.

[0026] Preferably, the upper mounting frame is provided with four limiting supports at its four corners.

[0027] Preferably, the two milling wheels and the two milling wheel extension rings are arranged coaxially.

[0028] The beneficial effects of this utility model are:

[0029] The square pile drill bit provided by this utility model transmits power to the split spindle box through the power mechanism. The split spindle box drives the two milling wheels and the two milling wheel extension rings at the left and right ends to rotate synchronously, so as to realize synchronous digging by the two milling wheels at the left and right ends. By setting the milling wheel extension rings at the outer end of the milling wheel, milling wheel extension rings of different lengths can be quickly replaced, and the hole length of the pile can be freely changed.

[0030] The square pile drill bit provided by the utility model is characterized in that the rotary supporting bearing rotating end is fixedly connected with the milling wheel adapter flange, the output end of the speed reducer and the milling wheel are fixedly connected with the milling wheel adapter flange, the milling wheel adapter flange is fixed on the rotary supporting bearing rotating end, the rotary supporting bearing is used as a medium to share the load pressure of the milling wheel, and the speed reducer and the milling wheel are directly connected. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a perspective view of the square pile drill bit of the utility model;

[0032] Figure 2 It is a sectional view of the square pile drill bit of the utility model;

[0033] Figure 3 It is a right lower part enlarged view of the utility model; Figure 2

[0034] Figure 4 It is an internal schematic view of the gear box of the utility model;

[0035] Figure 5 It is a schematic view of the connecting mechanism in the utility model;

[0036] Figure 6 It is a schematic view of the distributing main shaft box and the speed reduction connecting mechanism of the utility model;

[0037] Figure 7 It is a schematic view of the milling wheel and the milling wheel lengthening ring of the utility model;

[0038] REFERENCE SIGNS:

[0039] 1, upper mounting frame; 11, limiting support; 2, square head connector; 3, power mechanism; 31, gear box; 32, power source; 33, power input gear; 34, power transition gear; 35, power output gear; 36, power output shaft; 4, connecting mechanism; 41, top plate; 42, vertical plate; 43, bottom plate; 44, shaft hole; 5, distributing main shaft box; 51, box body; 52, main shaft; 53, main conical helical gear; 54, slave shaft; 55, slave conical helical gear; 56, main shaft bearing; 57, slave shaft bearing; 58, main shaft bearing cover; 59, slave shaft bearing cover; 6, milling wheel; 61, wheel body; 62, tooth seat; 63, digging tooth; 64, inner pull fork wear-resistant ring; 65, pull fork tooth seat; 66, first guide ring; 67, second guide ring; 7, milling wheel lengthening ring; 8, speed reduction connecting mechanism; 81, speed reducer; 82, rotary supporting bearing; 83, water sealing adapter flange; 84, milling wheel adapter flange. DETAILED DESCRIPTION

[0040] ​The utility model discloses a concept, specific structure and the technical effect produced will be clearly and completely described below in combination with the embodiment and the drawing to fully understand the purpose, features and effects of the utility model.

[0041] Embodiment 1

[0042] A square pile drill bit, as shown in Figure 1 And Figure 2 It comprises an upper mounting frame 1, a square head connector 2, a power mechanism 3, a middle connecting mechanism 4, a split main shaft box 5, a milling wheel 6 and a milling wheel extension ring 7.

[0043] The square head connector 2 and the power mechanism 3 are both mounted on the upper mounting frame 1, the middle connecting mechanism 4 connects the upper mounting frame 1 and the split main shaft box 5, the milling wheel 6 is provided with two and is assembled at the left and right ends of the split main shaft box 5 respectively, and the milling wheel extension ring 7 is provided with two and is assembled at the outer ends of the two milling wheels 6 respectively.

[0044] The power mechanism 3 is drivingly connected with the split main shaft box 5, the split main shaft box 5 is drivingly connected with the two milling wheels 6 at the left and right ends, the power mechanism 3 transmits power to the split main shaft box 5, and the split main shaft box 5 drives the two milling wheels 6 at the left and right ends and the two milling wheel extension rings 7 to rotate synchronously.

[0045] In the embodiment, the upper mounting frame 1 is used for mounting the square head connector 2, the power mechanism 3 and the middle connecting mechanism 4; the square head connector 2 is used for establishing the connection of the rotary excavator and the whole square pile drill bit; the power mechanism 3 is used for providing power for the square pile drill bit; the middle connecting mechanism 4 is used for establishing the external connection of the upper part of the upper mounting frame 1 and the lower part of the split main shaft box 5; and the milling wheel 6 and the milling wheel extension ring 7 are used for excavating, and meanwhile the milling wheel extension ring 7 can freely change the length of the pile hole.

[0046] In the embodiment, the power mechanism 3 transmits power to the split main shaft box 5, and the split main shaft box 5 drives the two milling wheels 6 at the left and right ends and the two milling wheel extension rings 7 to rotate synchronously, so as to realize the synchronous excavation of the two milling wheels 6 at the left and right ends; by arranging the milling wheel extension ring 7 at the outer end of the milling wheel 6, different lengths of the milling wheel extension ring 7 can be quickly replaced, and the length of the pile hole can be freely changed.

[0047] Embodiment 2

[0048] The embodiment is further described on the basis of embodiment 1, as shown in Figure 4 The power mechanism 3 comprises a gear box 31, a power source 32, a power input gear 33, a power transition gear 34, a power output gear 35 and a power output shaft 36.

[0049] The gear box 31 is assembled on the upper mounting frame 1, the power sources 32 are provided with two and are assembled on the gear box 31, the diameters of the power input gears 33, the power transition gears 34 and the power output gears 35 are sequentially increased and are all located in the gear box 31, the power input gears 33 are provided with two and are assembled on the output shafts of the two power sources 32 respectively, the power transition gears 34 are engaged with the two power input gears 33 respectively, the power output gears 35 are engaged with the power transition gears 34, and the power output shaft 36 is fixed at one end on the power output gears 35 and is connected in drive with the transfer case 5 through the middle connecting mechanism 4.

[0050] In the embodiment, the power mechanism 3 is provided to increase the torque and change the power output position. Specifically, the power sources 32 can be hydraulic motors, motors, engines and the like, the two power sources 32 output rotation and drive the two power input gears 33 to rotate, the two power input gears 33 drive the power transition gears 34 to rotate, the power transition gears 34 drive the power output gears 35 to rotate, the power output gears 35 drive the power output shaft 36 to rotate, and the power output shaft 36 drives the gears inside the transfer case 5 to rotate. The two power sources 32 are provided to increase the power, and the diameters of the power input gears 33, the power transition gears 34 and the power output gears 35 are sequentially increased and are engaged with each other to reduce the rotation speed and increase the torque.

[0051] Embodiment 3

[0052] The embodiment is further described based on the embodiment 2, as shown in the figure, the middle connecting mechanism 4 includes a top plate 41, a vertical plate 42 and a bottom plate 43; the top plate 41 is assembled on the upper mounting frame 1, the vertical plate 42 is connected at the top end with the top plate 41 and is connected at the bottom end with the bottom plate 43, the bottom plate 43 is assembled on the transfer case 5, and the top plate 41, the vertical plate 42 and the bottom plate 43 are provided with shaft holes 44 for the power output shaft 36 to pass through. Figure 5 In the embodiment, the middle connecting mechanism 4 in the form of the above-mentioned top plate 41, the vertical plate 42 and the bottom plate 43 is provided to connect the upper part of the upper mounting frame 1 and the lower part of the transfer case 5, and the shaft holes 44 are provided for the power output shaft 36 to pass through.

[0053] Embodiment 4

[0054] The embodiment is further described based on the embodiment 3, as shown in the figure, the transfer case 5 includes a case body 51, a main shaft 52, a main conical helical gear 53, a slave shaft 54 and a slave conical helical gear 55;

[0055] Figure 3

[0056] ​​The box 51 is assembled on the middle connecting mechanism 4, the main shaft 52 is vertically assembled in the box 51 and is drivingly connected with the power mechanism 3, the main conical bevel gear 53 is assembled on the main shaft 52, two from shafts 54 and two from conical bevel gears 55 are provided, the two from shafts 54 are horizontally assembled in the box 51 and are drivingly connected with the two milling wheels 6 respectively, and the two from conical bevel gears 55 are assembled on the two from shafts 54 and are in mesh with the main conical bevel gear 53.

[0057] In the embodiment, the power output shaft 36 drives the main shaft 52 to rotate, the main shaft 52 drives the main conical bevel gear 53 to rotate, the main conical bevel gear 53 drives the left and right two from conical bevel gears 55 to rotate, the left and right two from conical bevel gears 55 drive the left and right two from shafts 54 to rotate, and the left and right two from shafts 54 drive the left and right two milling wheels 6 to rotate. The input power is decomposed by the cooperation of the conical bevel gear 2:1 speed ratio, so that the power source can output to the two milling wheels at the same time.

[0058] As shown in Figure 3 , the transfer main shaft box 5 further comprises a main shaft bearing 56, a from shaft bearing 57, a main shaft bearing cover 58 and a from shaft bearing cover 59;

[0059] The main shaft bearing 56 and the from shaft bearing 57 are located in the box 51, the main shaft 52 and the from shaft 54 are assembled in the main shaft bearing 56 and the from shaft bearing 57 respectively, and the main shaft bearing cover 58 and the from shaft bearing cover 59 are assembled on the side of the main shaft bearing 56 and the from shaft bearing 57 respectively.

[0060] In the embodiment, the main shaft bearing 56 and the from shaft bearing 57 are provided to facilitate the rotation of the main shaft 52 and the from shaft 54, and the main shaft bearing cover 58 and the from shaft bearing cover 59 are provided to waterproof the main shaft bearing 56 and the from shaft bearing 57.

[0061] Embodiment 5

[0062] The embodiment is further described on the basis of embodiment 4, as shown in Figure 7 , the milling wheel extension ring 7 is provided with a plurality of different lengths, the milling wheel extension ring 7 is detachably assembled at the outer end of the milling wheel 6, different lengths of the milling wheel extension ring 7 can be quickly replaced, and the length of the machine pile hole can be freely changed.

[0063] The milling wheel 6 and the milling wheel extension ring 7 both comprise a wheel body 61, a tooth seat 62 and a digging tooth 63; a plurality of tooth seats 62 are assembled on the wheel body 61, and a digging tooth 63 is assembled on each of the plurality of tooth seats 62 for breaking the rock stratum.

[0064] As shown in Figure 1 and Figure 7As shown, the inner side of the milling wheel 6 is provided with an inner pullout fork wear-resistant ring 64, and the pullout fork tooth seat 65 is movably assembled on the inner pullout fork wear-resistant ring 64, and the digging tooth 63 is assembled on the pullout fork tooth seat 65. The outer side of the middle connecting mechanism 4 and the split main shaft box 5 is provided with a first guide ring 66 for guiding the pullout fork tooth seat 65, and the outer side of the main shaft box 5 is further provided with a second guide ring 67 for guiding the pullout fork tooth seat 65. The pullout fork tooth seat 65 moves between the first guide ring 66 and the second guide ring 67.

[0065] In this embodiment, the inner pullout fork wear-resistant ring 64 is used to interact with the pullout fork tooth seat 65 to change the running track of the tooth seat. The pullout fork tooth seat 65 controls the change of the digging tooth angle by moving on the inner pullout fork wear-resistant ring 64, so that the hole has no blind area, no dead angle and no leakage point. The patent CN221144313U in the background art has a blind area in the middle part of the square pile that cannot be excavated. The square pile bit of the present embodiment has the inner pullout fork wear-resistant ring 64, the pullout fork tooth seat 65 and the digging tooth 63 on the inner side of the milling wheel 6. The digging tooth 63 on the pullout fork tooth seat 65 can swing left and right to excavate, so as to excavate the middle part. The first guide ring 66 and the second guide ring 67 fully surround the outer contour to guide the pullout fork tooth seat and prevent it from being stuck. Specifically, as shown in Figure 7 When the pullout fork tooth seat 65 rotates to the left to reach the first guide ring 66, the outer end of the pullout fork tooth seat 65 abuts against the first guide ring 66, which limits and guides the pullout fork tooth seat 65. When the pullout fork tooth seat 65 rotates to the right to reach the second guide ring 67, the inner end of the pullout fork tooth seat 65 abuts against the second guide ring 67, which limits and guides the pullout fork tooth seat 65.

[0066] Embodiment 6

[0067] This embodiment is further described on the basis of embodiment 5, as shown in Figure 3 and Figure 6 As shown, the square pile bit further comprises a speed reduction connecting mechanism 8, which comprises a speed reducer 81, a slewing support bearing 82, a water sealing adapter flange 83 and a milling wheel adapter flange 84.

[0068] The input end of the speed reducer 81 is drivingly connected with the output end of the split main shaft box 5. The fixed end of the slewing support bearing 82 is fixed on the split main shaft box 5 through the water sealing adapter flange 83, and the rotating end is fixedly connected with the milling wheel adapter flange 84. The milling wheel adapter flange 84 is fixedly connected with the output end of the speed reducer 81 and the milling wheel 6, respectively.

[0069] In this embodiment, the speed reducer 81 is used to reduce the rotation output by the transfer headstock 5, and increase the output torque. The slewing support bearing 82 is used to share the load pressure of the milling wheel, and avoid the direct connection between the speed reducer 81 and the milling wheel 6. The water sealing adapter flange 83 is used to connect the transfer headstock 5 and the slewing support bearing 82, and the water sealing adapter flange 83 is provided with a dust cover, a sealing ring, and can be used in complex working conditions such as water holes and mud holes, so as to prolong the service life of the speed reducer. The milling wheel adapter flange 84 is used to connect the slewing support bearing 82, the speed reducer 81 and the milling wheel 6.

[0070] As shown in Figure 1 The four corners of the upper mounting frame 1 are provided with four limiting supports 11. The two milling wheels 6 and the two milling wheel extension rings 7 are coaxially arranged.

[0071] In order to better understand the utility model, the working principle of the utility model is described once completely as follows:

[0072] The power mechanism 3 rotates and transmits the rotation to the transfer headstock 5. Specifically, the two power sources 32 output the rotation and drive the two power input gears 33 to rotate, the two power input gears 33 drive the power transition gears 34 to rotate, the power transition gears 34 drive the power output gears 35 to rotate, the power output gears 35 drive the power output shafts 36 to rotate, and the power output shafts 36 drive the main shafts 52 in the transfer headstock 5 to rotate.

[0073] The transfer headstock 5 uses the cooperation of the tapered helical gears with a 2:1 speed ratio to decompose the input power and output the power to the two speed reducers 81. Specifically, the main shafts 52 drive the main tapered helical gears 53 to rotate, the main tapered helical gears 53 drive the left and right two slave tapered helical gears 55 to rotate, the left and right two slave tapered helical gears 55 drive the left and right slave shafts 54 to rotate, and the left and right slave shafts 54 drive the two speed reducers 81 to rotate.

[0074] The two speed reducers 81 further reduce the rotation and drive the two milling wheels 6 and the two milling wheel extension rings 7 to rotate, and the digging teeth 63 on the milling wheels are used to break the rock stratum.

[0075] The above describes the embodiments of the utility model, but the utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent or replacements are all included in the range defined by the claims of the utility model.

Claims

1. A square pile drill bit, characterized by, It includes upper mounting frame (1), square head connector (2), power mechanism (3), middle connecting mechanism (4), split main shaft box (5), milling wheel (6) and milling wheel extension ring (7); The square head connector (2) and the power mechanism (3) are installed on the upper mounting frame (1), the middle connecting mechanism (4) connects the upper mounting frame (1) and the split main shaft box (5), the milling wheel (6) is provided with two and is assembled at the left and right ends of the split main shaft box (5), and the milling wheel extension ring (7) is provided with two and is assembled at the outer ends of the two milling wheels (6). The power mechanism (3) is drivingly connected with the split main shaft box (5), the split main shaft box (5) is drivingly connected with the two milling wheels (6) at the left and right ends, the power mechanism (3) transmits power to the split main shaft box (5), and the split main shaft box (5) drives the two milling wheels (6) at the left and right ends and the two milling wheel extension rings (7) to rotate synchronously.

2. A matrix bit as defined in claim 1 wherein, The power mechanism (3) includes a gear box (31), a power source (32), a power input gear (33), a power transition gear (34), a power output gear (35) and a power output shaft (36); The gear box (31) is assembled on the upper mounting frame (1), the power source (32) is provided with two and is assembled on the gear box (31), the diameters of the power input gear (33), the power transition gear (34) and the power output gear (35) increase in sequence and are located in the gear box (31), the power input gear (33) is provided with two and is assembled on the output shaft of the two power sources (32), the power transition gear (34) is meshed with the two power input gears (33), the power output gear (35) is meshed with the power transition gear (34), one end of the power output shaft (36) is fixed on the power output gear (35), the other end passes through the middle connecting mechanism (4) and is drivingly connected with the split main shaft box (5).

3. A matrix bit as defined in claim 2 wherein, The middle connecting mechanism (4) includes a top plate (41), a vertical plate (42) and a bottom plate (43); The top plate (41) is assembled on the upper mounting frame (1), the vertical plate (42) is connected with the top plate (41) at the top end and is connected with the bottom plate (43) at the bottom end, the bottom plate (43) is assembled on the split main shaft box (5), and the top plate (41), the vertical plate (42) and the bottom plate (43) are provided with shaft holes (44) for the power output shaft (36) to pass through.

4. A square pile bit as claimed in claim 1, wherein The split main shaft box (5) includes a box body (51), a main shaft (52), a main conical helical gear (53), a slave shaft (54) and a slave conical helical gear (55); The box (51) is assembled on the middle connecting mechanism (4), the main shaft (52) is vertically assembled in the box (51) and is drivingly connected with the power mechanism (3), the main conical helical gear (53) is assembled on the main shaft (52), the slave shaft (54) and the slave conical helical gear (55) are both provided with two, the two slave shafts (54) are horizontally assembled in the box (51) and are drivingly connected with two milling wheels (6) respectively, and the two slave conical helical gears (55) are assembled on the two slave shafts (54) and are engaged with the main conical helical gear (53) respectively.

5. A matrix bit as defined in claim 4 wherein, The split main shaft box (5) further comprises a main shaft bearing (56), a slave shaft bearing (57), a main shaft bearing cover (58) and a slave shaft bearing cover (59); The main shaft bearing (56) and the slave shaft bearing (57) are located in the box (51), the main shaft (52) and the slave shaft (54) are assembled in the main shaft bearing (56) and the slave shaft bearing (57) respectively, and the main shaft bearing cover (58) and the slave shaft bearing cover (59) are assembled on the side edges of the main shaft bearing (56) and the slave shaft bearing (57) respectively.

6. A drill bit as defined in claim 1 wherein, The milling wheel lengthening ring (7) is provided with a plurality of different lengths, and the milling wheel lengthening ring (7) is detachably assembled at the outer end of the milling wheel (6). The milling wheel (6) and the milling wheel lengthening ring (7) both comprise a wheel body (61), a tooth seat (62) and a digging tooth (63); a plurality of tooth seats (62) are assembled on the wheel body (61), and the digging tooth (63) is assembled on the plurality of tooth seats (62).

7. A matrix bit as defined in claim 6 wherein, The inner side of the milling wheel (6) is provided with an inner pull fork wear ring (64), the pull fork tooth seat (65) is movably assembled on the inner pull fork wear ring (64), the digging tooth (63) is assembled on the pull fork tooth seat (65), the outer sides of the middle connecting mechanism (4) and the split main shaft box (5) are both provided with a first guide ring (66) for guiding the pull fork tooth seat (65), the outer side of the main shaft box (5) is further provided with a second guide ring (67) for guiding the pull fork tooth seat (65), and the pull fork tooth seat (65) moves between the first guide ring (66) and the second guide ring (67).

8. A square pile bit as claimed in claim 1, wherein The square pile drill bit further comprises a speed reduction connecting mechanism (8), the speed reduction connecting mechanism (8) comprises a speed reducer (81), a rotary support bearing (82), a water sealing transfer flange (83) and a milling wheel transfer flange (84); The input end of the speed reducer (81) is drivingly connected with the output end of the split main shaft box (5), the fixed end of the rotary support bearing (82) is fixed on the split main shaft box (5) through the water sealing transfer flange (83), the rotating end is fixedly connected with the milling wheel transfer flange (84), and the milling wheel transfer flange (84) is fixedly connected with the output end of the speed reducer (81) and the milling wheel (6) respectively.

9. A square pile bit as claimed in claim 1, wherein Four limiting supports (11) are arranged at the four corner positions of the upper mounting frame (1).

10. A square pile bit as claimed in claim 1, wherein, The two milling wheels (6) and the two milling wheel lengthening rings (7) are coaxially arranged.

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